There is no red in the image. This has been well documented and there are variations of this image out there. Hit CTRL + and REALLY zoom in, there's no red.

And if you STARE directly at the red, it becomes B/W. When looking away then back you momentarily see the complimentary color of cyan which is basically red.

Taking a BW photo of the image defeats the purpose of the illusion since the cyan is the key to the whole thing. I can dig up my "Psychophysics and physiology of color vision" notes or look in my Adlers Physiology of the Eye, but there is no red. Also, the world is flat, but everyone knew that.

Though I doubt such a person exists; if one had never seen a can of Coke, would he still see 'red'?

I suspect a person would given the cyan that floods the rest of the image. It's called lateral inhibition I believe where retinal cells determine edges and have an inhibitory response to one cell and excitatory response to neighbors.

https://www.animations.physics.unsw....ry-colours.htm

So, your mind isn't tricking you (because you think a Coke can should be red), your eyes are.

I can buy that.

There is no trick. The flood of cyan and the relatively sparse area of no color makes you see the complimentary color due to lateral inhibition. If that cyan was all Red you'd see cyan in the coke can. Sometimes physics explains more than we able to believe.

Don't believe me do this exercise, then when you see red where NO RED EXISTS we'll talk. :bigbye::corn::whistle:

This is what's happening.

https://www.animations.physics.unsw....-colours.htm#2

Didn't work for me Andy.... Nothing changed.

The eyes don't have the ability to define color - only the brain can define a color. The eyes simply send the image of the light rays to the brain.





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What happens if you’re colorblind?